从byte []创建和保存图像会导致参数无效异常

I have implemented the following functionality that connects to webservice and downloads a favicon from a given site and saves it to a byte[] which I store in our database. I now want to set it up so that it saves the icon to the disk. However I am getting a "Parameter is not valid" when I try and create the image from the byte[].

我已经实现了以下连接到webservice并从给定站点下载favicon的功能，并将其保存到我存储在数据库中的byte []中。我现在想要设置它，以便将图标保存到磁盘。但是，当我尝试从byte []创建图像时，我得到“参数无效”。

My code is as follows..

我的代码如下..

stream.Write(imageByteArray, 0, imageByteArray.Length);
Image i = Image.FromStream(stream); // EXCEPTION HAPPENS HERE.
i.Save(@"C:\tmp\" + filename + ".ico");

The exception occurs on the middle line.

例外发生在中间行。

This code works perfectly 9 times out of ten, but for some favicons, even thought the icon is a valid image (or at least it appears to be and it shows in the browser when point at it) I get this exception.

这个代码在十分之一的情况下完美地运行了9次，但是对于某些favicons，甚至认为图标是有效的图像（或者至少它看起来是，并且当它指向它时它在浏览器中显示）我得到了这个例外。

Does anyone have any ideas? I am pulling my hair out here!

有没有人有任何想法？我在这里拔头发！

Thanks

谢谢

Dave

戴夫

Edit: The value in the array that appears to throw the error is 127.

编辑：出现抛出错误的数组中的值为127。

3 个解决方案

#1

There's no need to put it into an image, just spit the bytes straight out:

没有必要将它放入图像中，只需直接吐出字节：

var fs = new BinaryWriter(new FileStream(@"C:\\tmp\\" + filename + ".ico", FileMode.Append, FileAccess.Write));
fs.Write(imageByteArray);
fs.Close();

#2

I knew you had the answer you need but I just want to go on your original idea. I think the problem is your byte array somehow had been changed and become byte char array, you just need to add this code to make it become byte array again:

我知道你有你需要的答案，但我只是想继续你最初的想法。我认为问题是你的字节数组以某种方式被改变并成为字节字符数组，你只需要添加这个代码，使它再次成为字节数组：

for (int i=0;i<imageByteArray.Length;i++)
{
    imageByteArray[i]=(byte) imageByteArray[i];
}

I had this problem and solved it by this solution. Good luck!

我有这个问题并通过这个解决方案解决了。祝你好运！

#3

Add image format:

添加图片格式：

stream.Position = 0;
i.Save(@"C:\tmp\" + filename + ".ico", System.Drawing.Imaging.ImageFormat.Icon);

#1